Only the countries you see behind the menu item with the nice flags (language selection) can be used.
AFAIK there is no support for romanian language.
These are the supported languages:
Malay Portuguese Brazil Catalan
Croatian Czech Danish
Dutch Estonian Finnish
Flemish French German
Greek Hungarian Spanish International
Italian Latvian Lithuanian
Norwegian Polish Portuguese
Russian Slovakian Slovenian
South African Spanish Swedish
Turkish UK English US English
And I'm pretty sure TT is not adding anything to list soon.
However, there is a request in the TT support board : [Only registered and activated users can see links. ],
if enough user would join that request TT might react and at least give an answer to why or if there is support planned.